i'm new here but i have question about penis size how come that all of the research says that average penis size for full grown man is 5.13 inch but soo many boys on here say that there's is over 6 inches. mine is 3.75 btw but i'm only 13 and 3 months.

I'm guessing there are a variety of explanations for that. For starters, it's possible that it's an inaccurate number; unfortunately, very few reputable studies have been conducted on that sort of topic, and the numbers tend to vary from anywhere between 5 and 6 inches. Then there's also likely at least a little variance on the end of the poster; for one, I would imagine that those with larger than average penises would be far more likely to tell people than those with smaller than average penises. And finally, while I'd like to think that everyone on VT is honest, there's also likely more than a little fudging of numbers, whether on purpose or on accident. That's not to say you shouldn't trust people who say they have 8" penises, but it's probably safe to assume that not EVERYONE who says he has an 8" penis actually does.